chore(package): update typedoc to version 0.15.0

Author: greenkeeper[bot]

package.json

@@ -36,7 +36,7 @@
     "nyc": "^13.0.1",
     "source-map-support": "^0.5.9",
     "ts-node": "^8.1.1",
-    "typedoc": "^0.14.0",
+    "typedoc": "^0.15.0",
     "typescript": "^3.1.1",
     "typings": "^2.1.1"
   },